Stone Veneer Calculator
Works out flat veneer and corner pieces for a wall. Corners are priced and sold separately by length, so they are calculated separately here too.
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The formula
flat area = (wall area − openings − corner length × 0.15) × (1 + waste) corner length = total outside corner length × (1 + waste)
Corner pieces are L-shaped and wrap round the angle, so they cover wall on two faces. Each linear metre of corner takes care of about 0.15 m² that would otherwise be flat stone — forgetting the deduction means buying that area twice.
What to watch out for
Two numbers go on the order, and only one of them is an area:
- Flat stone, by the square metre or square foot. The field of the wall.
- Corner pieces, by linear metre or foot. These cost considerably more each, and running out of them mid-job is the usual cause of a second delivery.
Adhered veneer also needs what goes behind it: a weather-resistive barrier, metal lath, and a scratch coat before the stone is bedded. On an exterior wall that build-up is what keeps water out — the stone itself is not a weather barrier.
Frequently Asked Questions
How much stone veneer do I need?
Take the wall area, subtract openings, then subtract about 0.15 m² for every linear metre of outside corner, and add 10% waste. Corners are ordered separately by length.
How much flat area does a corner piece cover?
Roughly 0.15 m² per linear metre, or about half a square foot per linear foot. Corners wrap two faces, so that area comes off the flat stone order.
Do I need a scratch coat behind stone veneer?
For adhered veneer on an exterior wall, yes — a weather-resistive barrier, metal lath and a scratch coat. The stone is cladding, not a waterproof layer, and water that gets behind it has to be able to drain.